Stem cell (il)literacy
This sentence conflates the potential of embryonic stem cells and fertilized eggs. Researchers hope that the former, if implanted in a degenerated part of the body, will form various tissue types and potentially cure the degeneration. A fertilized egg is the first stage of an embryo, which if implanted in a women's uterus, develops into a fetus and then a new human.
These topics can be a bit confusing, and many advocates on both sides of the polarized debate have consciously worked to reshape the language. The mistakes made by most writers are due to the learning curve and the linguistic machinations of interested parties. Regardless of the cause, the public is too often left more confused than before.